Grinding-plate.



No. 805,176. PATENTED NOV. 21, 1905. J. F. WINGHELL, DEGD. L. L. wIIIIIIIIIIIIIIIIIIIII x. GRINDING PLATE. AAAAAAAAAAAAAAAAAAAAAAAAAA 2.

No. 805,176. PATENTED NOV. 21, 1905.

J. F. WINGHELL, DECD.

L. L. WINCHELL, ADMINISTRATRIX.

GRINDING PLATE.

APPLICATION FILED JAN. 27, 1902.

3 SHEETS-SHEET 2.

Wzmes s e s law/liar 4' e/AQLM f M flttorney No. 805,176. PATENTED NOV.21, 1905. J. F. WINCHELL, DEGD.

L. L. WINGHELL, ADMINISTRATRIX.

GRINDING PLATE. APPLIOATION FILED 5,111.27. 1902.

3 SHEETS-SHEET 3 Wzfiwsses lime/270i Him/"120 y UNITED STATES PATENTOFFICE.

JAMES F. WINCHELL, OF SPRINGFIELD, OHIO; LIDA L. VVINCHELL,ADMINISTRATRIX OF SAID JAMES F. WINCHELL, DECEASED, ASSIGNOR TO CHARLESE. PEASE AND VILLIAM B. ANDERSON,

OF DAYTON, OHIO.

GRINDING-PLATE.

T0 (0% whom it may concern:

Be itknown that 1, JAMES F. WINcHnLL, a citizen of the United States,and a resident of Springfield, county of Clarke, and State of Ohio, haveinvented a certain new and useful Improvement in Grinding-Plates, ofwhich the following is a full, clear, and exact description, referencebeing had to the accompanying drawings, forming part of thisspecification.

My invention relates to grinding-plates especially adapted for usein-attrition-mills in which it is customary to employ a pair of plateseach revolving at a high rate of speed in opposite direction. The corn,wheat, or material fed into the mill and which is to be operated upon bythe frictional or rubbing contact of the various particles with eachother is held by the faces of the plates by reason of their peculiarconstruction, and the material is thus reduced to meal or pulverized tothe desired state, this being regulated by the adjustment of the platescloser to or farther from each other.

My invention will be more fully hereinafter described, and illustratedinthe drawings, in which Figure 1 is a plan view of one of thegrinding-plates constructed in my improved manner, and Fig. 2 is a planview of the other or adjacent plate constructed in a similar manner andthe position of the circumferential ridges of the other plate shown indotted lines. Fig. 3 is a vertical section of the grinding-plates andhead-plates to which the grinding-plates are secured and the head-platesmounted on the revoluble shafts. Fig. 4 is a plan of a portion of agrinding-plate, showing a modified construction.

Like letters of reference indicate identical parts in the variousfigures.

The grinding-plates, which are generally made in sections a a, aresecurely fastened in any convenient manner to head-plates or disks A,which are keyed to revoluble shafts A, the two disks A, to which thegrinding-plates are secured, being keyed to separate shafts whichrevolve in opposite directions. The friction and wear on thegrinding-plates being quite severe, it is necessary to construct them ofhard metal.

The grain or other substance to be operated Specification of LettersPatent.

Application filed January 2'7, 1902. Serial No. 91,405.

Patented Nov. 21, 1905.

upon is fed into the space intermediate the plates from the center, oneof the disks A being provided with an opening at or near its center andwhich has communication with a hopper into which the material is fed.The material being fed in near the center, the centrifugal force of therevolving disks with their grinding-plates tends to throw the materialout from the eye of the plates to the periphery. By reason of theconstruction of the grinding-plates the centrifugal movement of thematerial is temporarily arrested by the circumferential rings, and theparticles are thus temporarily held and forced to act upon themselves.The plates being revolved of course also tend to give the material arevolving motion, which is in turn partially arrested by theradially-extending ribs or walls, and this constant action of the grainor material upon itself results in a powdering of the various particles.

As shown in the drawings, and especially illustrated in Figs. 1 and 2,the inner portion of the plates are not provided with thecircumferential ridges or ribs of the outer portion, and the plates arealso slightly tapered 0r sloped toward the eye or draft circle, thusmore readily permitting the substance to enter between the plates andfind temporary lodgment in the various rectangular pockets ordepressions, from which it is forced by the rapid revolution of theplates.

When the head-plates or disks with their respective grinding-plates arerotated in opposite directions, two powerful forces are at work on thematerial introduced, one a rotative force and the other a centrifugalforce. The grinding-plates being provided with radially-extending andcircumferential ridges have thus formed in their adjacent faces pocketsin which the material finds lodgment. The centrifugal force causes thematerial to endeavor to pass in a radial line from the eye to theperiphery. The rotative force causes the material in these pockets toendeavor to travel in a circular direction with the plate in whosepocket it has found lodgment. The combined effect of these forces causesthe material in one of the pockets to impinge forcibly against theradially-extending rib and also the circumferential ring.

With the plates as heretofore constructed, in which the circumferentialridges or walls form circular lines, the material in the pocket will beheld at a point in proximity to where the circular wall andradially-extending wall meet and with the combined action of the r0-tative and centrifugal forces exerted on the material cause the materialto be forced at the corner of the rectangular pockets. The rotativeforce being more powerful than the centrifugal, a portion of thematerial will be carried across the face of the radial rib at the cornerand ultimately wear down or round off the edge of the radial rib. Thiswearing away of the rib at this point of course resulted in a reducedcapacity of the mill, because of its permitting more of the material totravel around with the disks or head-plates and their respectivegrinding-plates instead of being moved out by the centrifugal forces.This also resulted in a constantlyinferior quality of the product, andit necessitated an increased consumption of power. My invention consistsin providing the surfaces or operating-faces of the plates with a seriesof ridges 0r ribs 5, extending circumferentially, and radially-extendingridges or ribscto form numerous depressions or pockets (Z, whosedistances from the center of the plate vary. It will be seen that theridges or ribs 6, producing circuitous lines or eccentric circles whichconstantly vary in the distance from the center, and the point ofimpingement of the material on the rib instead of being maintained at afixed point, as above described was the case with grinding-plates asheretofore constructed, it moves outward and inward as the varyingdistance of the ring approaches nearer to and recedes farther from thecenter, and the concentration of the material is not constantlymaintained at one and the same point on the radially extending ribs, butis compelled and permitted to move outward or inward by reason of theeccentricity or constantly varying of the walls or ribs b, thusenhancing the life and effectiveness of the grinding-plates and alsosecuring the service of a greater part if not the entire length of theradially-extending ribs before the grinding edges are worn down orrounded off, as was not the case with the constructions heretofore inuse wherein the radially-extending ridges or ribs were worn off at oneand the same point, thus making the plates defective long before theremaining portion of the radially-extending ribs had become worn. InFigs. 1 and 2 I show each dam or rib 6 independent of and at a differentdistance relative to the center of the combined or assen1- bled platefrom the next adjacent dam or rib, thus producing a broken or irregularline. The plates have their dressed or working faces placed adjacent orfacing each other and are practically similar, with the exception thatthe one (see Fig. 2) is provided with more circumferential ridges orribs, thus forming an additional circuitous line. It will be seen thatthe variability of the circuitous line formed by the circumferentialribs 6 practically does or may equal the distance between the circuitouslines 6 Z) on the other plate, thus utilizing the entiregrinding-surface of the plates. It will thus be apparent that with myimproved construction the life or period of usefulness of the plates isgreatly enhanced, as the entire grinding-surfaces of the plate arebrought into play, whereas in the former constructions the groove formedin the grinding ridges or surface by reason of the impingement of thematerial at one and the same point would make the plate useless longbefore the major portions of its surface had become worn.

in Fig. 4 I have illustrated a modified construction of thegrinding-surface, in which the circumferential ridges or ribs 6, formingeccentric lines about the face of the plate, and the eccentricity ordeviation of a ridge on the one plate may coincide with the spacebetween the circumferential ridges on the other or adjacent plate.

The advantages and results of my construction as heretofore describedare also obtained by the employment of plates having grindingsurfacesformed as just stated, and illustrated in said Fig. 4.

It is apparent that the constructions shown and described in thedrawings and specifications may be slightly modified without departingfrom the spirit of my invention, and I do not wish to limit myself totheexact constructions shown and described; but

hat I claim as my invention, and wish to secure by Letters Patent, is-

1. Agrinding-plate for mills provided with radially-extending ridges orribs and a series of circumferential ribs forming undulatory lines aboutthe faces of the plate, substantially as and for the purpose specified2. Grinding-plates for mills having radiallyextending ridges or ribs,and a series of cir cumferential ribs extending in undulatory linesabout the faces of the plates, the circumferential ribs intersecting theradial ribs to form pockets whose respective centers vary in theirdistance from the center of the plates, substantially as shown and forthe purpose specified.

3. A grinding-plate provided with radial and circumferential ridges orribs, the circumferential ridges intersecting the radial ridges andforming pockets in the faces of the plates, substantially every part ofthe circumferential ridges or ribs intermediate of adjacent radialridges, varying from the adjoining part in the distance from the centerof the plate, substantially as shown and described.

4. A grinding-plate for mills provided with radial and circumferentialridges or ribs, the circumferential ridges intersecting the radial ribsor ridges and forming pockets, substantial-ly every one of which variesin its distance from the center of said plate, substantially as shownand for the purpose described.

5. Grinding-plates with radial and circumferential ridges or ribs, thecircumferential ridges intersecting the radial ridges and formingpockets, the respective centers of substantially every pocket being atdifi'erent distances from the center of the plates, substantially asshown and described.

6. A set of sectoral grinding-plates, provided with radial andcircumferential ridges or ribs, the circumferential ridges formingundulatory lines about the faces of said plates, each circumferentialridge intersecting the radial ridges at different distances from thecenter of the plates to form pockets, the Whole being so arranged thatthe undulations in one circumferential ridge shall traverse the spaceintermediate of the circumferential ridges on the opposite plate,substantially as described and for the purpose specified. 7 A set ofgrinding-plates for mills, eacl provided With radial and circumferentialridges or ribs, the circumferential ridges intersecting the radialridges or ribs and forming pockets in the faces of the plates, thecircumferential ridges being so arranged as to form undulatory linesabout the faces of the plates, the undulations in said circumferentialridges being of a degree substantially equal to the length of thecorresponding pockets on the adjacent plate, substantially in the mannerand for the purpose described.

- JAMES F. WINCHELL. Witnesses:

GEORGE HEIDMAN, EDW. HAAT.

